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Low-temperature catalytic CO oxidation over mixed silver–copper oxide Ag2Cu2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
39017 45801 2016 10 PDF Available
Title
Low-temperature catalytic CO oxidation over mixed silver–copper oxide Ag2Cu2O3
Abstract

•Properties of mixed silver–copper oxide Ag2Cu2O3 with regard to catalytic CO oxidation were studied in detail.•Oxygen species with different reactivity towards CO were found on the surface of Ag2Cu2O3.•Paramelaconite structure was proposed to be responsible for low-temperature catalytic activity.

Mixed silver–copper oxide Ag2Cu2O3 was investigated by a combination of physicochemical techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature programmed reaction (TPR). The catalytic properties of Ag2Cu2O3 in the reaction of CO oxidation were studied by the TPR-CO + O2 method and compared with those of CuO nanopowder characterized by a similar specific surface area. On the surface of Ag2Cu2O3, two unequivalent oxygen species (Eb(O1s) = 529.4 eV and 531 eV) with different reaction probability towards CO were observed. Previously, similar oxygen species had been found on the surface of CuO nanopowder. Mixed silver–copper oxide interacted with CO at room temperature, which resulted in the surface reduction Cu2+ → Cu1+. Such reduction was accompanied by the removal of only oxygen with Eb(O1s) ∼ 531 eV. When the mixed oxide was heated in the reaction medium, both oxygen species were eliminated from the surface, leading to the partial decomposition of the Ag2Cu2O3 structure and the appearance of metallic silver. The TPR-CO study showed the presence of weakly bound oxygen species which can be adsorbed on oxygen vacancies in the Ag2Cu2O3 paramelaconite structure. The energy of oxygen vacancy formation on the (001) and (101) surfaces of Ag2Cu2O3 were calculated by periodic density functional theory (DFT). The role of different oxygen species in CO oxidation over the Ag2Cu2O3 surface is discussed.

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Keywords
Ag2Cu2O3; Mixed silver–copper oxide; CO oxidation; Oxygen species; XPS; Paramelaconite
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Low-temperature catalytic CO oxidation over mixed silver–copper oxide Ag2Cu2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 510, 25 January 2016, Pages 64–73
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us